Probably most of you already know this, but...

According to Wikipedia,

Stormtroopers were specialist soldiers of the German Army in World War I. In the last years of the war, Stoßtruppe were trained to fight with "infiltration tactics", part of the Germans' new method of attack on enemy trenches. Men trained in these methods were known in Germany as Sturmmann (literally "storm man" but usually translated as "stormtrooper"), formed into companies of Sturmtruppe ("assault troops", more often and less exactly "storm troops"). The infiltration tactics of the stormtroopers are still in use today, in one form or another. Other armies have also used the term "assault troops", "shock troops" or fireteams for specialist soldiers who perform the infiltration tasks of stormtroopers.

More photos...